Electrical quantity measuring device for electric cable

Abstract

Electrical quantity measuring device for energy transmission line, which is connected with electric line cable or device thereof availably, is comprised of a device for monitoring voltage signal and a device for monitoring current signal. The device for monitoring voltage signal is provided with metallic loop shape throughout capacitance (TV) which is configured coaxially with the cable and can be connected to a capacitor voltage divider. The device for monitoring the current signal is provided at least a current sensor with coil (TA), because the coil is easy to be affected when an induction effect current passing through the coil. The coil is arranged on at least one printed circuit board with central opening, and formed by radiated sediment provided in two surfaces of the printed circuit board and the electric connection of the radiated sediment on the two surfaces. Furthermore, an insulating material layer is provided and is configured to cover the printed circuit board partly; ametallic screen is also designed to cover the printed circuit board partly. The TV and the TA are assembled in an axial manner and merged until forming a unique body in an insulating material matrix,where the matrix delimits a through hole for introducing the cable.

Description

technical field [0001] The invention relates to an electrical quantity, especially voltage and current measuring device for an energy transmission line. [0002] The measuring device of the invention makes it convenient to use in circuit breakers, transformers, power stations or other network installations to provide voltage and / or current values ​​of cables, especially cables near electric towers. [0003] More specifically, the device of the invention is capable of supplying fault signallers with the voltage and current signals necessary for their functioning and preconfiguration of the power line control system. Background technique [0004] It is known that in areas where current is transmitted through high, medium and low voltage lines, there is an increasing need to receive punctual voltage and current information to allow optimal management of power lines and in particular to allow an increasingly efficient operation of faulty sections by remote control of the system ...

AI Technical Summary

Problems solved by technology

[0015] The disadvantage of these current measuring devices is that they cannot measure current intensity values ​​with sufficient accuracy, especially on high and medium voltage power lines, because they are subject to disturbances due to the presence of electric fields generated by the power lines themselves

[0016] In fact this electric field creates a capacitive coupling and a source of interference which affects both the TA and the electronic circuits of the same device used to process the signals found in the vicinity of the power line, thus making the measurement accuracy of the said device very small on bare cables

[0017] Current and voltage measuring devices commonly used in the market find it difficult to set up in power lines in practice

[0018] Moreover, the different technical requirements of the two measuring devices make their assembly into a single measuring device almost impossible

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